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Introduction

Athena is a grid-based code for astrophysical magnetohydrodynamics (MHD).
It was developed primarily for studies
of the interstellar medium, star formation, and accretion flows.
Athena has been made freely available to the community
in the hope that others may find it useful.

The current version (v4.0) implements algorithms for the following physics:

A variety of choices are also available for the numerical algorithms, such as different Riemann solvers
and spatial reconstruction methods.

The code has been developed using the GNU development tools,
maintaining strict adherence to ANSI standards, thus it should be possible
to configure, compile, and run the code on any platform that supports these
standards. Athena has been run on everything from a Mac laptop to a 25,000 processor Cray XT4.